feat: try to read the temperature

examples/temperature.rs

@@ -0,0 +1,49 @@
+#![no_main]
+#![no_std]
+
+use defmt::info;
+use hal::adc::{Adc, Ready, VTemp};
+use hal::gpio::Analog;
+use hal::gpio::gpiob::PB1;
+use panic_probe as _;
+
+use defmt_rtt as _; // global logger
+
+use cortex_m_rt::entry;
+use hal::{pac, prelude::*, rcc::Config};
+
+const MAGIC_TEMPERATURE_NUMBER: f32 = 12.412122;
+
+#[entry]
+fn main() -> ! {
+    let dp = pac::Peripherals::take().unwrap();
+    let cp = cortex_m::Peripherals::take().unwrap();
+
+    let mut rcc = dp.RCC.freeze(Config::hsi16());
+    let mut adc = dp.ADC.constrain(&mut rcc);
+
+    let gpiob = dp.GPIOB.split(&mut rcc);
+
+    let mut temp_pin = gpiob.pb1.into_analog();
+
+    // Get the delay provider.
+    let mut delay = cp.SYST.delay(rcc.clocks);
+
+    let mut temp;
+    let mut i = 0;
+    loop {
+        if i % 10_000 == 0 {
+            temp = read_temp_c(&mut temp_pin, &mut adc);
+            info!("Temperature: {}", temp);
+        }
+        // delay.delay_ms(200_u16);
+        i += 1;
+    }
+}
+
+fn read_temp_c(pin: &mut PB1<Analog>, adc: &mut Adc<Ready>) -> i16 {
+    let v: f32 = adc
+        .read(pin /* or maybe VTemp from the adc module? */)
+        .expect("could not read with adc");
+    (v / MAGIC_TEMPERATURE_NUMBER) as i16 - 50
+}